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Regarding the polyester thermoplastic Elastomer (TPEE) boot used in a Constant Velocity joint(CVJ), it is effective to adopt soft and low frictional coefficient (μ) TPEE material which achieves compact size, low frictional noise and easy assembling. However, in the conventional low hardness TPEE, both grease resistance and heat resistance deteriorate, so it was necessary to improve the structure of TPEE polymers. We developed the new soft TPEE CVJ boot, focusing on the improvement method of TPEE polymers and design factors to achieve the compact and low frictional noise boot.

The oil strainer is used in an automatic transmission in an effort to trap contaminated particles in the transmission oil and protect the valves and other parts from wearing prematurely. Recently in order to increase the reliability of the transmission, non-woven fabric has been used for the filtering material as it has good contamination trapping ability. On the other hand, oil-passing characteristics decrease by using non-woven fabrics as a filtering material. We analyzed the oil flow in an oil strainer by performing a computer simuration and at the same time obtained good results which were confirmed by visualization.

The characteristics of the elastomer material and the fiber cloth reinforcing material have been analyzed as related to diaphragm durability. Investigated were diaphragms used for waste gate actuators for controlling the boost pressure of turbochargers. In this presentation, the authors verify the importance of the elastomer material fatigue resistance under high temperatures and the elongation properties, including directional properties of the fiber cloth reinforcing material for the durability of the diaphragms.

NBR (acrylonitrile butadiene rubber) has been used for the oil seal equipped on a power steering. However, lack of heat resistance was occasionally observed for NBR, with the recent trend of customer's demand for increasing the life of oil seals in high temperature environmental condition. We developed an oil seal with H-NBR material, which could exhibit the superior performance in the heat resistance; however, it had a weak point in low temperature environment. We have developed HNBR1, the new H-NBR, which has been improved in the performance for low temperature [1]. HNBR1 has been applied for power steering seals as the rubber material, which has superior heat resistance, cold resistance and oil resistance.